What oil are you running

[94PrizmDD]

I have a 94 geo prizm with 144k miles. I use 20w-50 conventional oil. What brand? What ever is on sale that day. Last oil change I put Penzoil. I do change my oil every 3k miles.

[Bodger2]

Mobil Super 2000 High Mileage Extended Performance 10w30. It's good for preventing oil leaks in older vehicle and extends your oil change interval to 10,000 km (approx 6000 miles) Although I usually change it a bit earlier. I always keep a change or two on hand and only grab my brand when it's on sale.

[96coroll]

ya i use the mobil 2000 as well. Except i change my oil every 2000-2500km

[musclecar64]

Valvoline Maxlife synth-blend 10w30 every 3,000 to 3,500 mi. Purolator One filters. Also started using Z-Max last oil change. That made a HUGE difference.

[GTChink]

Valvoline 5w30 or Castrol Syntec 5w30, whatever is on sale. It's a corolla...lasts forever even without oil in the engine! MUAHAHA

[PhatRoyale]

German Castrol Syntec 0W30 + Wix Filter

Originally Posted by 94PrizmDD

I have a 94 geo prizm with 144k miles. I use 20w-50 conventional oil. What brand? What ever is on sale that day. Last oil change I put Penzoil. I do change my oil every 3k miles.

You don't need that heavy of an oil unless you're burning oil like no tomorrow and huge amounts of blue smoke are starting to appear from your tailpipe.

Just use what's recommended in the owners manual 5w30.

Originally Posted by musclecar64

Valvoline Maxlife synth-blend 10w30 every 3,000 to 3,500 mi. Purolator One filters. Also started using Z-Max last oil change. That made a HUGE difference.

Zmax is pure snake oil.

To be more accurate, it's actually just basic mineral oil with some food coloring added.

[musclecar64]

Originally Posted by PhatRoyale

German Castrol Syntec 0W30 + Wix Filter



You don't need that heavy of an oil unless you're burning oil like no tomorrow and huge amounts of blue smoke are starting to appear from your tailpipe.

Just use what's recommended in the owners manual 5w30.



Zmax is pure snake oil.

To be more accurate, it's actually just basic mineral oil with some food coloring added.

Regardless, since I put it in, my city mileage went from 24.5 to 27, and the engine runs smoother and pulls harder. Keep in mind, my engine used to be in VERY POOR condition before the car was mine. The results obviously wont be the same for an engine in good condition.

[96coroll]

do you guys believe in once you go synthetic you can't go back??

[MrGiggles]

I am using Pennzoil Ultra 10W-30 Full Synthetic right now with a Mobil 1 filter (paid 1.99 for it). I plan to run at least 7500 miles on this change.

[94PrizmDD]

Thanks for the reply's. My valve cover gasket was leaking, but i fixed it already. I been checking my oil for the past 500 miles and the level hasn't dropped. So i plan on going with a lighter oil next oil change. I use mobil 1 synthetic in my other cars. Do you think its too late to go synthetic at 144k miles?

[cipher93]

Whatever 5W30 is on sale... Castrol, Pennzoil, whatever. Makes no difference.

[topnotch]

i use castrol synthentic 10w-30 with denso oil filter.

[94PrizmDD]

I see Advance Auto Parts has a oil special right now. Mobil Clean 5000. 5 quarts and a purolator classic filter for 12.99.

[TierOneSupplier]

"Do you think its too late to go synthetic at 144k miles?"

No, I don't think so. Our 1MZ-FE (Sienna) had 262,190 miles when I finally made the switch from conventional to MaxLife full synthetic 5W-30. We're at 276,300 now. I've found that the choice of oil filter makes a huge difference, too. After experiencing a lot of valve clatter after the first start each morning, I learned that only a filter with a silicone anti-drainback valve will do. Wix and Purolator PureOne are my preference, and I hate the filters in orange cans!.

"do you guys believe in once you go synthetic you can't go back??"

Not really. I wouldn't be afraid to switch back but I'd keep an eye on things to see if anything changes.

[94PrizmDD]

oh the orange ones are Fram